. >>> also tonight, did the u.s. marine corps abandon a group of marines and military family members after they developed a rare and surprising disease? dr. nancy snyderman investigates a controversy. >> when is the leadership of the marine corps going to stand up and say we made a mistake? >>> also tonight, kate snow goes inside the fight to save the pandas including some of the very youngest. >> you are too cute. look at you. >> their ircystability is beyond dispute, so what is it about the effort to protect them that makes this wild life expert so upset. >> you said once i would happily eat the last panda on earth if you could spend the money on worth while. in all seriousness, why did you say that? >> "rock center" gets under way. good evening. welcome to "rock center." the first glimpse americans ever got of oscar pistorius was on this broadcast in the run-up to the summer olympic games in london. we aired what became the defining profile of him reported by mary carrillo of nbc sports who traveled to south afric